Seems like upon making changes to your computer's space, FH tried to adapt to that and caused this glitch?
I'd recommend trying to switch from Direct3D9 to OpenGL (or vice versa if these settings are rotated) within your in-game settings (under Rendering Subsystem). If nothing changes, perhaps uninstall and re-install the game through this method?:
1. Make a copy of your FH folder and place it somewhere else on your computer, if you don't want to lose any mods you have installed to the game on your desktop or within your documents folder for example).
2. Delete your FH folder from Local Disk (C:) (or wherever you had the folder located upon installation).
3. Re-install FH using the torrent version.
4. Check to see if this has fixed the issue before re-adding the mods bit-by-bit from your previous FH folder.
Glad you got everything sorted! Thank you everyone for your help =) I'll go ahead and lock this for you~